D3.js is a JavaScript library for producing dynamic, interactive data visualizations in web browsers.It makes use of Scalable Vector Graphics, HTML5, and Cascading Style Sheets standards.
The geoFoucaut() function in d3.js is used to draw Foucaut’s stereographic equivalent projection.
Syntax:
d3.geoFoucaut()
Parameters: This method does not accept any parameters.
Return Value: This method creates a Foucaut’s stereographic equivalent projection from given json data.
Example 1: The following example makes Foucaut projection of world with center at (0,0) and no rotation.
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <script src= </script> </head> <body> <div style="width:700px; height:500px;"> <svg width="600" height="450"></svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Foucaut projection // Center(0,0) with 0 rotation var gfg = d3.geoFoucaut() .scale(width / 1.5 / Math.PI) .rotate([0, 0]) .center([0, 0]) .translate([width / 2, height / 2]) // Loading the json data // Used json file stored at // /datageojson/master/world.json d3.json("https://raw.githubusercontent.com/" + "janasayantan/datageojson/master/world.json", function (data) { // Draw the map svg.append("g") .selectAll("path") .data(data.features) .enter().append("path") .attr("fill", "BurlyWood") .attr("d", d3.geoPath() .projection(gfg) ) .style("stroke", "#ffff") }) </script> </body> </html> |
Output:
Foucaut projection with no rotation and centered at (0,0)
Example 2: The following example makes Foucaut projection of world with changing the center and rotation.
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <script src= </script> </head> <body> <div style="width:700px; height:900px;"> <svg width="400" height="450"></svg> </div> <script> var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); // Fahey projection // Center(0,10) and 15 degree // rotation w.r.t Y axis var gfg = d3.geoFoucaut() .scale(width / 1.5 / Math.PI) .rotate([-15, 0]) .center([0, 10]) .translate([width / 2, height / 2]) // Loading the json data // Used json file stored at // /datageojson/master/world.json d3.json("https://raw.githubusercontent.com/" + "janasayantan/datageojson/master/world.json", function (data) { // Draw the map svg.append("g") .selectAll("path") .data(data.features) .enter().append("path") .attr("fill", "DarkOliveGreen") .attr("d", d3.geoPath() .projection(gfg) ) .style("stroke", "#ffff") }) </script> </body> </html> |
Output:
Foucaut projection with 15 degree rotation w.r.t Y axis and centered at (0,10)
